A suspect has not been named. However, in a news conference at New Orleans Police Department headquarters, Superintendent Ronal Serpas said there could be more than one shooter in the case. Watch video

The shooting began about 9 p.m. in the 2100 block of General de Gaulle Drive.

Detectives believe a shooter -- or shooters -- in a dark-colored vehicle, possibly an SUV, began firing at a black Honda sedan.

Amy Kinard was driving the Honda sedan. She's Butler's girlfriend of two years, and the mother of their son, Deshawn.

An emotional Amy Kinard said she had just picked up her son and the baby's father when a black SUV quickly approached from behind, within seconds, she said, someone in that vehicle opened fire on them.

"I tried to get out of the way, but I couldn't. They shot out my back window," said Kinard. "I was screaming for Deshawn, 'Please make sure our baby is alright!' but he never answered me.'"

Kinard said when she pulled over, her son was still breathing, but because he was wearing a stocking cap, she didn't know he had been shot.

"He's gone, I can't take this. This can't be real," she said. "He was only 7 months old. He didn't even make his first birthday," the crying mother said.

Butler was shot an unknown number of times and Kinard was shot in the left side of the head while sitting in a blue plaid car seat, police said.

Police found a black Honda sedan near the Crescent City Connection bridge toll plaza. It's not known why the car stopped at that location. Police said Wednesday night that they are trying determine whether a second shooting might have occurred.

Police said Butler was pronounced dead at the scene. Paramedics took Kinard to the nearest hospital, where he was pronounced dead.

“I've been crossing under yellow tape for decades, and it's difficult and disturbing every single time. But it was heartbreaking to see what was clearly a bullet hole in the side of a baby’s car seat," said NOPD Superintendent Ronal Serpas. "No family should have to endure the murder of a 7-month-old baby.”

Serpas said Wednesday that it's believed the shooter and Butler knew each other.

Serpas said that Butler was a member of the Fischer Fools gang and that the shooting may be gang related. Two gangs may be involved in the shooting -- the Fischer Fools gang and the Hot Blocks gang, Serpas said.

Police are asking anyone with information to call Crimestoppers at 822-1111. Crimestoppers announced the reward for information in this case was raised to $10,000.